CN1257757A - Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method - Google Patents
Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method Download PDFInfo
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- CN1257757A CN1257757A CN 99127015 CN99127015A CN1257757A CN 1257757 A CN1257757 A CN 1257757A CN 99127015 CN99127015 CN 99127015 CN 99127015 A CN99127015 A CN 99127015A CN 1257757 A CN1257757 A CN 1257757A
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Abstract
A tail gas recirculation system features that in the existing coal-spraying pulverization system using the afterheat of waste gas from hot air furnace for blast furnace, the part of tail gas from main exhaust blower is introduced via one or two parallel recirculation regulation valves to the inlet of draught fan for recirculating the tail gas. Said tail gas recirculation works only when the system starts, stops and runs under low load or the waste gas temp of hot air furnace is too high, which is caused by the failure in afterheat recovery equipment of hot air furnace. The method for controlling said system features that said waste gas regulation valves and recirculated gas regulation valve are used to control the recirculated waste gas amount and in turn the outlet gas temp of coal mill for saving energe and higher safety.
Description
The present invention relates to a kind of coal injection and pulverization of blast furnace system and control method thereof, particularly a kind of exhaust gas of hot-blast stove heating back that utilizes is as dry tail gas recirculation system for coal injection and pulverization of blast furnace and the control method thereof of carrying gas of powder process.
Now the coal injection and pulverization of blast furnace system that generally adopts be exhaust gas of hot-blast stove heating back as the dry gas of carrying of powder process, be exactly waste gas with hot-blast stove by the air-introduced machine drawing-in system, after the heating furnace heating, send into coal pulverizer; Raw coal is sent into the coal pulverizer through feeder from run coal bin; Raw coal in coal pulverizer while milling drying, coal dust is received coal dust with dry gas through cyclone separator and pocket type powder collector, the tail gas of receiving behind the powder enters atmosphere by main exhaust fan.The advantage of this system is that the waste heat of exhaust gas of hot-blast stove has obtained recycling, good energy-conserving effect.Shortcoming is when startup, shutdown and underrun; particularly under the situation of hot-blast stove waste-heat recovery device fault; the exhaust gas of hot-blast stove temperature is too high; at this moment can't control the coal pulverizer outlet temperature by heating furnace; need mix cold wind (fresh air); reach the purpose of control system temperature by the aperture of regulating cold blast sliding valve, cause the O that contains of system thus
2Amount raises (possibility＞8%), because coal suitable for blowing is inflammable and explosive bituminous coal.This just greatly reduces the security of pulverized coal preparation system.
Also having a kind of coal injection and pulverization of blast furnace system is self circulatory system fully, and it is without exhaust gas of hot-blast stove, only with the part of self powder process tail gas by air-introduced machine drawing-in system heating use, other technological process and last a kind of form basically identical.Its shortcoming is that the waste heat of exhaust gas of hot-blast stove does not obtain recycling, and advantage is that the coal pulverizer outlet temperature does not need to mix cold wind directly by heating furnace control in the pulverizing process, and security is good.
The object of the present invention is to provide a kind of tail gas recirculation system for coal injection and pulverization of blast furnace and control method thereof; to reach the waste heat that this system can recycle exhaust gas of hot-blast stove, again can be when startup, shutdown and underrun and hot-blast stove waste-heat recovery device fault code cause that the exhaust gas of hot-blast stove temperature is too high security good.
For achieving the above object, the present invention adopts following technical proposals: coal injection and pulverization of blast furnace of the present invention system and the existing the same waste gas of hot-blast stove that includes are through the exhaust gas of hot-blast stove control valve, introduce the coal injection and pulverization of blast furnace system by air-introduced machine, after the heating furnace heating, send in the coal pulverizer; Raw coal is sent into the coal pulverizer through feeder from run coal bin; Raw coal in coal pulverizer while milling drying; Coal dust is collected coal dust with dry gas through cyclone separator and pocket type powder collector, and the tail gas behind the receipts powder enters atmosphere by main exhaust fan.It is characterized in that the inlet that a part of tail gas that main exhaust fan is discharged is introduced air-introduced machine with pipeline through one or two recirculating gas control valve in parallel carries out exhaust gas recirculation, exhaust gas recirculation only participates in moving in the input coefficient when system's startup, shutdown and underrun and hot-blast stove waste-heat recovery device fault code cause that the exhaust gas of hot-blast stove temperature is too high.Like this, when system's startup, shutdown and underload fortune and waste heat recovery fault code, replace available technology adopting fresh air drawing-in system, guarantee the O that contains of system with tail gas
2Measure all the time less than 8%, thereby guarantee the safety that system moves.
The control method of tail gas recirculation system for coal injection and pulverization of blast furnace of the present invention is to control the coal injection and pulverization of blast furnace system temperature.The coal pulverizer outlet temperature is an important security control parameter in pulverized coal preparation system, mixes the operate as normal that recirculation tolerance guarantees system by control in these cases.It must satisfy two kinds of situations, 1) circulatory system started earlier when system started, and must satisfy the flow of the minimum discharge of coal pulverizer requirement, treat system stability after, enter the temperature-rise period of system again.2) at this moment EGT can't control the coal pulverizer outlet temperature by heating furnace up to 320 ℃ when the hot-blast stove waste heat recovery is broken down, and at this moment satisfies and controls the coal pulverizer outlet temperature and be no more than 90 ℃ by mixing recirculation tolerance.Recirculation tolerance must reach certain value, could satisfy system's control requirement.So the recirculating gas flow also is an important control parameter.In order to satisfy the requirement of above-mentioned two parameters, carry out gamut control with a recirculating gas control valve, its precision is relatively poor, for this reason, adopted the recirculating gas control valve of two parallel connections carry out parallel be adjusted to suitable.
Concrete system temperature control method is as follows:
When (one) system started, the recirculating gas control valve was in the standard-sized sheet position, and the exhaust gas of hot-blast stove control valve is in the complete shut-down position, the operation of exhaust gas recirculation input coefficient; After treating system stability, heating furnace 5 has been lighted, is in minimum load, slowly opens the exhaust gas of hot-blast stove control valve, and control coal pulverizer exit gas programming rate is 2～3 ℃/min; When exhaust gas of hot-blast stove control valve standard-sized sheet, slowly close the recirculating gas control valve, control coal pulverizer exit gas programming rate is 2～3 ℃/min, makes the coal pulverizer Outlet Gas Temperature reach 85～90 ℃, time-delay 1.8～2.2min feeder starts and puts into operation; Behind recirculating gas control valve complete shut-down, temperature control switches to by heating furnace controls the coal pulverizer outlet temperature.
When (two) system normally moves, keep the coal pulverizer outlet temperature by heating furnace, and exhaust gas recirculation is out of service.
(3) when the exhaust gas of hot-blast stove temperature is high, the automatic load down of heating furnace, when the heating furnace load was reduced to minimum load, temperature control switched to exhaust gas recirculation at once, and promptly keeping the coal pulverizer outlet temperature by adjusting recirculating gas control valve is 85～90 ℃.When the exhaust gas of hot-blast stove temperature is recovered just often, contract fully recirculating gas control valve is by heating furnace control coal pulverizer outlet temperature.
When (four) shutting down cooling; slowly minimizing along with coal-supplying amount; heating furnace is load shedding thereupon; when the heating furnace load drops to minimum load; it is 85～90 ℃ that the recirculating gas control valve is slowly opened control coal pulverizer Outlet Gas Temperature; to feeder shut down, heating furnace is flame-out; it is 0.9～1.2 ℃/min that the recirculating gas control valve is slowly opened big control cooling rate; when extremely following gas control valve standard-sized sheet again; slowly close the exhaust gas of hot-blast stove control valve; continuing the control cooling rate is 0.9～1.2 ℃/min, until exhaust gas of hot-blast stove control valve contract fully.
The present invention has following conspicuous outstanding feature and remarkable advantage compared with prior art: the present invention introduces exhaust gas recirculation in utilizing the coal injection and pulverization of blast furnace system of exhaust gas of hot-blast stove waste heat.When normal operation,, reach energy-saving effect by the former pulverized coal preparation system operation that utilizes the exhaust gas of hot-blast stove waste heat; And when startup, shutdown and underrun and hot-blast stove waste-heat recovery device fault code caused that the exhaust gas of hot-blast stove temperature is too high, the O that contains of system was guaranteed in the operation of exhaust gas recirculation input coefficient
2Amount avoids system the danger of blast to occur all the time less than 8%, guarantees security of system.The control method of native system is an exhaust gas recirculation tolerance when controlling startup, shutdown and underrun by the collaborative adjusting of exhaust gas of hot-blast stove control valve and recirculating gas control valve; thereby control coal pulverizer Outlet Gas Temperature is 85～90 ℃, makes system security of operation under the situation occur above-mentioned.
Accompanying drawing is the system architecture schematic diagram of one embodiment of the invention.
An optimum implementation of the present invention is: referring to accompanying drawing, this tail gas recirculation system for coal injection and pulverization of blast furnace is: the waste gas of hot-blast stove 1 is through exhaust gas of hot-blast stove stop valve 2 and exhaust gas of hot-blast stove control valve 3, introduce the coal injection and pulverization of blast furnace system by air-introduced machine 4, after heating furnace 5 heating, send in the coal pulverizer 7 through hot-blast valve 6; Raw coal is sent into the coal pulverizer 7 through feeder 9 from run coal bin 8; Raw coal in coal pulverizer 7 while milling drying, coal dust is received coal dusts with dry gas through cyclone separator 10 and pocket type powder collector 11, receives tail gas behind the powder through main exhaust fan inlet stop valve 12 and main exhaust fan inlet control valve 13, enters atmosphere by main exhaust fan 14; The inlet that a part of tail gas that main exhaust fan 14 is discharged is introduced air-introduced machines 4 with pipeline through the recirculating gas control valve 16 of two parallel connections carries out exhaust gas recirculation, exhaust gas recirculation only when system's startup, shutdown and underrun and hot-blast stove waste-heat recovery device fault code cause that the exhaust gas of hot-blast stove temperature is too high input coefficient move.On air-introduced machine 4 inlet ducts, keep and connect the cool air hose that cold blast sliding valve 15 is arranged, as unexpected emergency power.
The control method of this coal injection and pulverization of blast furnace recirculating system no longer repeats as above-mentioned control method.
Claims (2)
1. tail gas recirculation system for coal injection and pulverization of blast furnace, the waste gas that comprises hot-blast stove (1) are introduced the coal injection and pulverization of blast furnace system through exhaust gas of hot-blast stove control valve (3) by air-introduced machine (4), send in the coal pulverizer (7) after heating furnace (5) heating; Raw coal is sent into the coal pulverizer (7) through feeder (9) from run coal bin (8); Raw coal in coal pulverizer (7) while milling drying; coal dust is received coal dust with dry gas through cyclone separator (10) and pocket type powder collector (11); tail gas behind the receipts powder enters atmosphere by main exhaust fan (14); it is characterized in that the inlet that a part of tail gas that main exhaust fan (14) is discharged is introduced air-introduced machine (4) with pipeline through one or two recirculating gas control valve (16) in parallel carries out exhaust gas recirculation, exhaust gas recirculation only when system's startup, shutdown and underrun and hot-blast stove waste-heat recovery device fault code cause that the exhaust gas of hot-blast stove temperature is too high input coefficient participate in moving.
2. control method according to the described tail gas recirculation system for coal injection and pulverization of blast furnace of claim 1, it is characterized in that: when (one) system starts, recirculation control valve (16) is in the standard-sized sheet position, and exhaust gas of hot-blast stove is regulated and transferred (3) to be in the complete shut-down position, the operation of exhaust gas recirculation input coefficient; After treating system stability, heating furnace (5) is lighted, is in minimum load, slowly opens exhaust gas of hot-blast stove control valve (3), and control coal pulverizer (7) exit gas programming rate is 2～3 ℃/min; When exhaust gas of hot-blast stove control valve (3) standard-sized sheet, slowly close recirculating gas control valve (6), control coal pulverizer (7) exit gas programming rate is 2～3 ℃/min, makes coal pulverizer (7) Outlet Gas Temperature reach 85～90 ℃, and time-delay 1.8～2.2min feeder (9) starts and puts into operation; Behind recirculating gas control valve 16 complete shut-downs, temperature control switches to by heating furnace (5) controls the coal pulverizer outlet temperature; When (two) system normally moves, keep coal pulverizer (7) outlet temperature by heating furnace (5), and exhaust gas recirculation is out of service; (3) when hot-blast stove (1) when EGT is high, heating furnace (5) is load down automatically, when heating furnace (5) load is reduced to minimum load, temperature control switches to exhaust gas recirculation at once, promptly keeping the coal pulverizer outlet temperature by adjusting recirculating gas control valve (16) is 85～90 ℃, when hot-blast stove (1) waste gas recovers just often, contract fully recirculating gas control valve (16) is by heating furnace (5) control coal pulverizer (7) outlet temperature; When (four) shutting down cooling; slowly minimizing along with coal-supplying amount; heating furnace (5) is load shedding thereupon; when heating furnace (5) load is reduced to minimum load; it is 85～90 ℃ that recirculating gas control valve (16) is slowly opened control coal pulverizer Outlet Gas Temperature; shut down to feeder; heating furnace (5) is flame-out; recirculating gas control valve (16) is 0.9～1.2 ℃/min slowly to open big control cooling rate; during to recirculating gas control valve (16) standard-sized sheet; slowly close exhaust gas of hot-blast stove control valve (3); continuing the control cooling rate is 0.9～1.2 ℃/min, closes fully until exhaust gas of hot-blast stove control valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99127015A CN1076636C (en) | 1999-12-29 | 1999-12-29 | Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99127015A CN1076636C (en) | 1999-12-29 | 1999-12-29 | Tail gas recirculation system for coal injection and pulverization of blast furnace and its control method |
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| CN1257757A true CN1257757A (en) | 2000-06-28 |
| CN1076636C CN1076636C (en) | 2001-12-26 |
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| CN100486711C (en) * | 2007-02-08 | 2009-05-13 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| WO2009092236A1 (en) * | 2008-01-16 | 2009-07-30 | Jianfeng Han | An igniting and stable combusting device and its usage method of pulverized coal boiler |
| CN102174663A (en) * | 2011-01-18 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Blast-furnace coal injection pulverization flue gas system and control method thereof |
| CN102425940A (en) * | 2011-11-25 | 2012-04-25 | 宝钢工程技术集团有限公司 | Device and method for preparing and transporting lime rotary kiln pulverized coal |
| CN101716548B (en) * | 2009-12-22 | 2012-09-19 | 武汉科技大学 | Grinding system used for extracting vanadium from stone coal |
| CN103301921A (en) * | 2013-05-21 | 2013-09-18 | 吴海鸥 | Energy-saving and emission-reducing device and method for industrial vertical mill |
| US8573520B2 (en) | 2009-01-21 | 2013-11-05 | Paul Wurth S.A. | Method of producing pulverized coal |
| CN103495488A (en) * | 2013-10-18 | 2014-01-08 | 南京钢铁股份有限公司 | Full automatic control method and system for blast furnace pulverizing systems |
| CN104613494A (en) * | 2014-08-06 | 2015-05-13 | 上海明华电力技术工程有限公司 | Powder storage device for fast load variation of supercritical or ultra-supercritical coal-fired boiler |
| CN106766830A (en) * | 2016-11-18 | 2017-05-31 | 江苏长虹智能装备集团有限公司 | Smoke heat replacing device and heat supply method |
| CN107185701A (en) * | 2017-06-01 | 2017-09-22 | 中国神华能源股份有限公司 | The method and apparatus resumed operation after being tripped for coal pulverizer |
| CN109252006A (en) * | 2018-11-12 | 2019-01-22 | 武汉钢铁有限公司 | The coal powder injection apparatus of blast furnace and its control method of controllable medium-speed pulverizer entrance oxygen content |
| CN115212671A (en) * | 2022-06-29 | 2022-10-21 | 成都易态科技有限公司 | Ash discharge method, ash discharge system and yellow phosphorus flue gas purification system |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108099A (en) * | 1985-11-03 | 1987-05-13 | 马鞍山钢铁公司 | The method and apparatus that the blast-furnace hot-air furnace flue gas exhaust heat utilizes |
| CN1066072C (en) * | 1992-04-06 | 2001-05-23 | 鞍山钢铁公司 | Process for powdering system of bituminous coal |
| CN1117405A (en) * | 1994-08-22 | 1996-02-28 | 戴阿朱玛斯公司 | Pulverized coal fuel preparation process |
-
1999
- 1999-12-29 CN CN99127015A patent/CN1076636C/en not_active Expired - Fee Related
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| CN100486711C (en) * | 2007-02-08 | 2009-05-13 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| WO2009092236A1 (en) * | 2008-01-16 | 2009-07-30 | Jianfeng Han | An igniting and stable combusting device and its usage method of pulverized coal boiler |
| AU2010207708B2 (en) * | 2009-01-21 | 2015-08-20 | Paul Wurth S.A. | Method for producing pulverized coal |
| US8573520B2 (en) | 2009-01-21 | 2013-11-05 | Paul Wurth S.A. | Method of producing pulverized coal |
| EP2389456B1 (en) | 2009-01-21 | 2017-12-20 | Paul Wurth S.A. | Method for producing pulverized coal |
| CN102292459B (en) * | 2009-01-21 | 2014-12-03 | 保尔伍斯股份有限公司 | Method for producing pulverized coal |
| CN101716548B (en) * | 2009-12-22 | 2012-09-19 | 武汉科技大学 | Grinding system used for extracting vanadium from stone coal |
| CN102174663A (en) * | 2011-01-18 | 2011-09-07 | 中冶赛迪工程技术股份有限公司 | Blast-furnace coal injection pulverization flue gas system and control method thereof |
| CN102425940A (en) * | 2011-11-25 | 2012-04-25 | 宝钢工程技术集团有限公司 | Device and method for preparing and transporting lime rotary kiln pulverized coal |
| CN103301921A (en) * | 2013-05-21 | 2013-09-18 | 吴海鸥 | Energy-saving and emission-reducing device and method for industrial vertical mill |
| CN103495488A (en) * | 2013-10-18 | 2014-01-08 | 南京钢铁股份有限公司 | Full automatic control method and system for blast furnace pulverizing systems |
| CN104613494A (en) * | 2014-08-06 | 2015-05-13 | 上海明华电力技术工程有限公司 | Powder storage device for fast load variation of supercritical or ultra-supercritical coal-fired boiler |
| CN104613494B (en) * | 2014-08-06 | 2017-08-25 | 上海明华电力技术工程有限公司 | Storage powder device for super or ultra supercritical coal-burning boiler quick load change |
| CN106766830A (en) * | 2016-11-18 | 2017-05-31 | 江苏长虹智能装备集团有限公司 | Smoke heat replacing device and heat supply method |
| CN107185701A (en) * | 2017-06-01 | 2017-09-22 | 中国神华能源股份有限公司 | The method and apparatus resumed operation after being tripped for coal pulverizer |
| CN107185701B (en) * | 2017-06-01 | 2018-09-14 | 中国神华能源股份有限公司 | The method and apparatus resumed operation after tripping for coal pulverizer |
| CN109252006A (en) * | 2018-11-12 | 2019-01-22 | 武汉钢铁有限公司 | The coal powder injection apparatus of blast furnace and its control method of controllable medium-speed pulverizer entrance oxygen content |
| CN115212671A (en) * | 2022-06-29 | 2022-10-21 | 成都易态科技有限公司 | Ash discharge method, ash discharge system and yellow phosphorus flue gas purification system |
| CN115212671B (en) * | 2022-06-29 | 2023-07-04 | 成都易态科技有限公司 | Ash discharging method, ash discharging system and yellow phosphorus flue gas purifying system |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
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Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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